CN103510383A - Method for improving crease resistance and shrinkage resistance of Lyocell bamboo fiber - Google Patents

Abstract

The invention relates to a method for improving crease resistance and shrinkage resistance of a Lyocell bamboo fiber. The method comprises the steps that Lyocell bamboo fiber fabric is subjected to two immersion and two rolling in a finishing liquid, and a drying treatment technology, a baking treatment technology and an aftertreatment technology are adopted sequentially, wherein the finishing liquid comprises the following components in parts by weight: 40-60 parts of finishing agent, 2-3 parts of penetrating agent, and 940-960 parts of water. Compared with the prior art, the method adopts a rapid finishing method, and is low in cost, high in baking speed and ultra-low in methanal release; no catalyst is required; and the crease resistance and the shrinkage resistance of the Lyocell bamboo fiber can be improved greatly. In addition, when a softening agent is added during finishing, the draping (smooth in hand feeling) and the air permeability of the fabric can be improved, and the softening agent has no significant influence on the strength of the fabric.

Description

A method for improving the anti-wrinkle and anti-shrinkage performance of Lyocell bamboo fiber

technical field

The invention relates to the application field of printing and dyeing finishing technology in textile materials, in particular to a method for improving the anti-wrinkle and anti-shrinkage performance of Lyocell bamboo fiber.

Background technique

Bamboo pulp fiber has a series of good properties and has been loved by consumers. But the bamboo pulp fiber that uses more at present all is the viscose fiber that replaces cotton pulp with bamboo pulp substantially. Because the viscose bamboo pulp fiber adopts the traditional viscose production process, while maintaining the excellent performance of viscose fiber, it also has the same disadvantages as ordinary viscose fiber, such as insufficient wet strength, hard water, easy deformation of the fabric, and environmental impact Larger etc. Shanghai Leo Fiber Enterprise Development Co., Ltd. has successfully developed Lyocell bamboo pulp fiber with bamboo pulp as raw material by using solvent spinning technology. The Lyocell bamboo pulp fiber produced is much better than ordinary viscose bamboo pulp fiber in terms of wearing performance. , its single fiber strength is close to that of polyester, and its wet modulus is unmatched by ordinary viscose bamboo pulp fibers. Compared with the production process of traditional cellulose fibers, the production process of Lyocell bamboo pulp fibers does not involve any chemical reactions, and only uses non-toxic NMMO as a solvent, so it has no pollution to the environment. At present, with the increasingly widespread application of Lyocell bamboo fiber, especially the increase in the proportion of Lyocell bamboo fiber/cotton fiber and Lyocell bamboo fiber/viscose fiber blended products in bamboo fiber bedding products, more and more consumers are paying more and more attention. focus on.

Although Lyocell bamboo fiber bedding products have excellent characteristics have been generally recognized. However, the existing traditional Lyocell bamboo fiber bedding is usually blended with other fibers (such as viscose fiber, cotton fiber, etc.), and there are generally disadvantages such as large shrinkage rate, unstable size, and easy wrinkling, especially the large shrinkage rate (approx. It is about 10%) seriously exceeding the standard and causing the problem that it cannot be washed and can only be dry-cleaned. This is a problem that needs to be solved at present.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of Lyocell bamboo fiber and its blended products such as large shrinkage, unstable size, and easy wrinkling, and to develop a fast, easy, no additional catalyst, fast baking speed, and low release of formaldehyde. The functional processing technology that can greatly improve the anti-wrinkle and anti-shrinkage performance of Lyocell bamboo fiber makes the treated Lyocell bamboo fiber and its blended products have good dimensional stability and non-ironing finishing effect.

The purpose of the present invention can be achieved through the following technical solutions:

A method for improving the anti-wrinkle and anti-shrinkage performance of Lyocell bamboo fiber, the method adopts the following steps:

The high Lyocell bamboo fiber fabric is subjected to two dipping and two rolling treatments in the finishing solution, and then successively adopts drying treatment, baking treatment and post-treatment process;

In the two dipping and two rolling treatments, the liquid rolling rate is 60%-90%,

The temperature of the drying treatment is 85°C-100°C, and the time is 5min-8min;

The temperature of the baking treatment is 140°C-150°C, and the time is 3min-5min;

The post-treatment includes cold water washing, soaping, hot water washing, cold water washing, and drying process;

The composition of the finishing liquid includes the following components and contents in parts by weight: 40-60 finishing agent; 2-3 penetrating agent; 940-960 water.

The composition of the finishing liquid also includes a softener, and the finishing liquid adopts the following components and contents in parts by weight: 40-60 of the finishing agent; 10-20 of the softening agent, 2-3 of the penetrating agent; and 920-950 of the water.

The finishing agent is an ultra-low formaldehyde high-activity finishing resin system, the appearance is a light yellow transparent liquid, and the pH value is 2-3.

The ultra-low-formaldehyde high-activity finishing resin system is based on modified dimethylol dihydroxyethylene urea, and contains a catalyst and a high-activity reactive crosslinking agent.

The modified dimethylol dihydroxy ethylene urea is etherified dimethylol dihydroxy ethylene urea. As a preferred embodiment, the etherified dimethylol dihydroxy ethylene urea includes methyl etherified dihydroxy ethylene urea Methyl dihydroxyethylene urea, etherified dimethylol dihydroxy ethylene urea.

The catalyst is magnesium chloride or a compound of magnesium chloride and citric acid.

The penetrating agent includes nonionic surfactant JFC or anionic surfactant red oil.

The softener is a hydroxysilane softener, a silicone fatty alcohol softener or a silicone softener.

Compared with the prior art, the present invention adopts the rapid finishing method, which has low cost, no additional catalyst, fast baking speed and ultra-low release of formaldehyde, and can greatly improve the anti-wrinkle and anti-shrinkage performance of Lyocell bamboo fiber. Anti-wrinkle finishing generally utilizes finishing agents to cross-link fibers. When the system is subjected to external force, due to covalent crosslinking or resin fixation, it can only reduce the deformation of cellulose macromolecules, and more importantly, stabilize the original hydrogen bond structure, reduce the possibility of forming new hydrogen bonds, and improve Improve the recovery ability of deformation, so as to achieve the purpose of anti-wrinkle.

When the highly active reactive cross-linking finishing agent containing catalyst of the present invention is used to carry out wrinkle-proof finishing to Lyocell bamboo fiber, the finishing agent and Lyocell bamboo fiber have cross-linked action, and the finishing agent has occurred between the macromolecular chains in the fiber amorphous region. The cross-linking reaction forms a network structure, which restricts the relative movement between Lyocell bamboo fiber macromolecules and basic structural units, and improves the anti-wrinkle performance of the fiber, while the crystal structure of the fiber basically does not change. At the same time, adding a softener during finishing can also improve the drapability (smooth hand feeling) and air permeability of the fabric, and has no obvious impact on the strength of the fabric.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments.

Example 1

Changes in anti-wrinkle and anti-shrinkage properties of Lyocell bamboo fiber fabrics under different finishing conditions

Take the resin finishing agent A with a concentration of 50g/L, and the penetrating agent JFC at 2g/L, and double-dip and second-roll the fabric (the squeeze rate is 80%) with the finishing agent → drying (90°C, 6min) → baking (150°C, 3min ) → post-processing

Take the 60g/L 2D resin (dimethylol dihydroxyethylene urea) finishing agent, add 12g/L catalyst MgCl ₂ , 2g/L penetrating agent JFC, and double-dip and double-roll the fabric (the liquid squeeze rate is 80%). →Drying (80°C, 8min)→Baking (150°C, 4min)→Post-processing

Determination of changes in anti-wrinkle and anti-shrinkage properties of Lyocell bamboo fiber fabrics.

Table 1 Effects of different finishing agents on the anti-wrinkle and anti-shrinkage properties of Lyocell bamboo fiber fabrics

It can be seen from Table 1 that after adding the resin finishing agent A provided by the present invention, the fabric elasticity is obviously improved, which is slightly higher than that of the 2D resin finishing agent, but its shrinkage rate is lower than that of the 2D resin finishing agent, and the formaldehyde emission is obviously lower than that of the 2D resin finishing agent. 2D resin, its data are shown in Table 2.

Example 2

Release of formaldehyde from Lyocell bamboo fiber fabrics treated with different finishing agents

Take the resin finishing agent A with a concentration of 50g/L, and the penetrating agent JFC at 2g/L, and double-dip and second-roll the fabric (the squeeze rate is 80%) with the finishing agent → drying (90°C, 6min) → baking (150°C, 3min ) → post-processing

Take the 60g/L 2D resin (dimethylol dihydroxyethylene urea) finishing agent, add 12g/L catalyst MgCl ₂ , 2g/L penetrating agent JFC, and double-dip and double-roll the fabric (the liquid squeeze rate is 80%). → Drying (80°C, 8min) → Baking (150°C, 4min-5min) → Post-processing

Determination of changes in anti-wrinkle and anti-shrinkage properties of Lyocell bamboo fiber fabrics.

Table 2 Effects of different baking temperatures on the anti-wrinkle and anti-shrinkage and formaldehyde release of Lyocell bamboo fiber fabrics

Example 3

Changes in anti-wrinkle and anti-shrinkage properties of Lyocell bamboo fiber fabrics after adding softener

Take the concentration of 50g/L resin finishing agent A, 15g/L silicone body fatty alcohol softener CFC, penetrating agent JFC 2g/L, two-dipping and two-rolling the fabric (rolling liquid rate 80%) finishing agent → drying (90 ℃ , 6min)→baking (150℃, 3min)→post-processing

Take 60g/L 2D resin (dimethylol dihydroxyethylene urea) finishing agent, add 12g/L catalyst MgCl ₂ , 15g/L silicone body fatty alcohol softener CFC, 2g/L penetrating agent JFC, the fabric two Dip two pads (rolling liquid rate 80%) finishing agent → drying (80°C, 8min) → baking (150°C, 4min) → post-treatment

Determination of changes in anti-wrinkle and anti-shrinkage properties of Lyocell bamboo fiber fabrics.

Table 3 The effect of softener on the anti-wrinkle and anti-shrinkage performance of Lyocell bamboo fiber fabric

It can be seen from Table 3 that the elasticity of the fabric can be improved after adding the softener, that is, the anti-wrinkle performance of the fabric is improved.

Example 4

Effects of different finishing agents on the strength, drape and air permeability of Lyocell bamboo fiber fabrics

Take the resin finishing agent A with a concentration of 50g/L, and the penetrating agent JFC at 2g/L, and double-dip and second-roll the fabric (the squeeze rate is 80%) with the finishing agent → drying (90°C, 6min) → baking (150°C, 3min ) → post-processing

Take the 60g/L 2D resin (dimethylol dihydroxyethylene urea) finishing agent, add 12g/L catalyst MgCl ₂ , 2g/L penetrating agent JFC, and double-dip and double-roll the fabric (the liquid squeeze rate is 80%). → Drying (80°C, 8min) → Baking (150°C, 4min) → Post-processing

Determination of changes in strength, drape and air permeability of Lyocell bamboo fiber fabrics.

Table 4 Effects of different finishing agents on the strength, drape and air permeability of Lyocell bamboo fiber fabrics

Note: The smaller the drape coefficient, the better the drapability; the larger the air permeability value, the better the air permeability.

It can be seen from Table 4 that the addition of resin finishing agent A has no significant impact on the drape and air permeability of the fabric, and the addition of resin finishing agent A has less impact on the fabric drape and air permeability than the addition of 2D resin finishing agent. At the same time, the impact of the resin finishing agent A on the strength of the fabric is also smaller than that of the 2D resin finishing agent.

Example 5

Changes in strength, drape and air permeability of Lyocell bamboo fiber fabrics after adding softener

Get concentration and be 50g/L resin finishing agent A, 15g/L silicone fatty alcohol softening agent CFC, 2g/L penetrating agent JFC, the finishing agent→drying (90% by 80% of liquid squeeze ratio) of fabric two dipping ℃, 6min)→baking (150℃, 3min)→post-treatment

Take 60g/L 2D resin (dimethylol dihydroxyethylene urea) finishing agent, add 12g/L catalyst MgCl ₂ , 15g/L silicone body fatty alcohol softener CFC, 2g/L penetrating agent JFC, the fabric two Dip two pads (rolling liquid rate 80%) finishing agent → drying (80°C, 8min) → baking (150°C, 4min) → post-treatment

Determination of changes in strength, drape and air permeability of Lyocell bamboo fiber fabrics.

Table 5 Effect of softener on strength, drapability and air permeability of Lyocell bamboo fiber fabric

Note: The smaller the drape coefficient, the better the drapability; the larger the air permeability value, the better the air permeability.

It can be seen from Table 5 that the drapability and air permeability of the fabric are improved after adding the softener, and the influence on the strength of the fabric is reduced, and the above properties of the fabric after adding the resin finishing agent A are better than those of the 2D resin finishing agent.

It can be seen that, by using the technology of the present invention to treat the fabric, the anti-wrinkle and anti-shrinkage performance is improved, and the amount of formaldehyde released is reduced. Its various indicators are better than 2D resin finishing agents, and there is no significant impact on the physical and mechanical properties of the fabric. .

Claims (9)

1. improve a method for Lyocell bamboo fibre anti-wrinkle shrink-proof performance, the method adopts following steps:

Lyocell bamboo fiber is carried out in dressing liquid to two and soak two and roll processing, and then adopt drying and processing successively, bake and process and aftertreatment technology;

Described two soak two rolls in processing, and pick-up rate is 60%-90%,

The temperature of described drying and processing is 85 ℃-100 ℃, and the time is 5min-8min;

The described temperature that bakes processing is 140 ℃-150 ℃, and the time is 3min-5min;

Described post processing comprises cold wash, soap boiling, hot water wash, cold wash, stoving process;

It is characterized in that, the constituent of described dressing liquid comprises following component and weight portion content: finishing agent 40-60; Bleeding agent 2-3; Water 940-960.

2. a kind of method that improves Lyocell bamboo fibre anti-wrinkle shrink-proof performance according to claim 1, is characterized in that, the constituent of described dressing liquid also comprises softener, and dressing liquid adopts following component and weight portion content: finishing agent 40-60; Softener 10-20, bleeding agent 2-3; Water 920-950.

3. a kind of method that improves Lyocell bamboo fibre anti-wrinkle shrink-proof performance according to claim 1 and 2, is characterized in that, described finishing agent is that ultra-low formaldehyde high activity arranges resin system, and outward appearance is micro-yellow transparent liquid, and pH value is 2-3.

4. a kind of method that improves Lyocell bamboo fibre anti-wrinkle shrink-proof performance according to claim 3, it is characterized in that, described ultra-low formaldehyde high activity arranges resin system and take modification hydroxymethyl-2 dihydroxy-ethylene urea as basis, includes the high activity reactant cross-linker of catalyst.

5. a kind of method that improves Lyocell bamboo fibre anti-wrinkle shrink-proof performance according to claim 4, is characterized in that, described modification hydroxymethyl-2 dihydroxy-ethylene urea is etherificate hydroxymethyl-2 dihydroxy-ethylene urea.

6. a kind of method that improves Lyocell bamboo fibre anti-wrinkle shrink-proof performance according to claim 5, it is characterized in that, described etherificate hydroxymethyl-2 dihydroxy-ethylene urea comprises methyl-etherified hydroxymethyl-2 dihydroxy-ethylene urea or ether hydroxymethyl-2 dihydroxy-ethylene urea.

7. a kind of method that improves Lyocell bamboo fibre anti-wrinkle shrink-proof performance according to claim 4, is characterized in that, described catalyst is the compound of magnesium chloride or magnesium chloride and citric acid.

8. a kind of method that improves Lyocell bamboo fibre anti-wrinkle shrink-proof performance according to claim 1 and 2, is characterized in that, described bleeding agent comprises non-ionic surface active agent JFC or anion surfactant chilli oil.

9. a kind of method that improves Lyocell bamboo fibre anti-wrinkle shrink-proof performance according to claim 2, is characterized in that, described softener is silicol softener, silicone body fat alcohols softener or silicone based softener.